﻿using System;
using System.Collections;
using System.Data;
using System.Data.OleDb;
using PumpTotalTime;

namespace SharedLibrary
{
    /// <summary>
    ///     数据库的通用访问代码 苏飞修改
    ///     此类为抽象类，
    ///     不允许实例化，在应用时直接调用即可
    /// </summary>
    public abstract class SqlHelper
    {
        /// <summary>
        ///     数据库连接字符串
        /// </summary>
        public static readonly string connectionString =
            ConfigPump.DbConstr;

        // Hashtable to store cached parameters
        private static readonly Hashtable parmCache = Hashtable.Synchronized(new Hashtable());


        /// <summary>
        ///     为执行命令准备参数
        /// </summary>
        /// <param name="cmd">OleDbCommand 命令</param>
        /// <param name="conn">已经存在的数据库连接</param>
        /// <param name="trans">数据库事物处理</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param>
        /// <param name="cmdParms">返回带参数的命令</param>
        private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans,
            CommandType cmdType, string cmdText, OleDbParameter[] cmdParms)
        {
            //判断数据库连接状态
            if (conn.State != ConnectionState.Open)
                conn.Open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            //判断是否需要事物处理
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = cmdType;
            if (cmdParms != null)
            {
                foreach (var parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

        /// <summary>
        ///     Execute a OleDbCommand that returns a resultset against the database specified in the connection string
        ///     using the provided parameters.
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>A OleDbDataReader containing the results</returns>
        public static OleDbDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            var cmd = new OleDbCommand();
            var conn = new OleDbConnection(connectionString);
            // we use a try/catch here because if the method throws an exception we want to 
            // close the connection throw code, because no datareader will exist, hence the 
            // commandBehaviour.CloseConnection will not work
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                var rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }

        /// <summary>
        ///     Execute a OleDbCommand that returns a resultset against the database specified in the connection string
        ///     using the provided parameters.
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>A OleDbDataReader containing the results</returns>
        public static OleDbDataReader ExecuteReader(CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            var cmd = new OleDbCommand();
            var conn = new OleDbConnection(connectionString);
            // we use a try/catch here because if the method throws an exception we want to 
            // close the connection throw code, because no datareader will exist, hence the 
            // commandBehaviour.CloseConnection will not work
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                var rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }


        /// <summary>
        ///     add parameter array to the cache
        /// </summary>
        /// <param name="cacheKey">Key to the parameter cache</param>
        /// <param name="cmdParms">an array of SqlParamters to be cached</param>
        public static void CacheParameters(string cacheKey, params OleDbParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }

        /// <summary>
        ///     Retrieve cached parameters
        /// </summary>
        /// <param name="cacheKey">key used to lookup parameters</param>
        /// <returns>Cached SqlParamters array</returns>
        public static OleDbParameter[] GetCachedParameters(string cacheKey)
        {
            var cachedParms = (OleDbParameter[]) parmCache[cacheKey];
            if (cachedParms == null)
                return null;
            var clonedParms = new OleDbParameter[cachedParms.Length];
            for (int i = 0, j = cachedParms.Length; i < j; i++)
                clonedParms[i] = (OleDbParameter) ((ICloneable) cachedParms[i]).Clone();
            return clonedParms;
        }


        /// <summary>
        ///     检查是否存在
        /// </summary>
        /// <param name="strSql">Sql语句</param>
        /// <returns>bool结果</returns>
        public static bool Exists(string strSql)
        {
            var cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, null));
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }

        /// <summary>
        ///     检查是否存在
        /// </summary>
        /// <param name="strSql">Sql语句</param>
        /// <param name="cmdParms">参数</param>
        /// <returns>bool结果</returns>
        public static bool Exists(string strSql, params OleDbParameter[] cmdParms)
        {
            var cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms));
            if (cmdresult == 0)
            {
                return false;
            }
            return true;
        }

        #region//ExecteNonQuery方法

        /// <summary>
        ///     执行一个不需要返回值的OleDbCommand命令，通过指定专用的连接字符串。
        ///     使用参数数组形式提供参数列表
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此OleDbCommand命令执行后影响的行数</returns>
        public static int ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            var cmd = new OleDbCommand();
            using (var conn = new OleDbConnection(connectionString))
            {
                //通过PrePareCommand方法将参数逐个加入到OleDbCommand的参数集合中
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                var val = cmd.ExecuteNonQuery();
                //清空OleDbCommand中的参数列表
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        ///     执行一个不需要返回值的OleDbCommand命令，通过指定专用的连接字符串。
        ///     使用参数数组形式提供参数列表
        /// </summary>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此OleDbCommand命令执行后影响的行数</returns>
        public static int ExecteNonQuery(CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecteNonQuery(connectionString, cmdType, cmdText, commandParameters);
        }

        /// <summary>
        ///     存储过程专用
        /// </summary>
        /// <param name="cmdText">存储过程的名字</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此OleDbCommand命令执行后影响的行数</returns>
        public static int ExecteNonQueryProducts(string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters);
        }

        /// <summary>
        ///     Sql语句专用
        /// </summary>
        /// <param name="cmdText">T_Sql语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个数值表示此OleDbCommand命令执行后影响的行数</returns>
        public static int ExecteNonQueryText(string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecteNonQuery(CommandType.Text, cmdText, commandParameters);
        }

        #endregion

        #region//GetTable方法

        /// <summary>
        ///     执行一条返回结果集的OleDbCommand，通过一个已经存在的数据库连接
        ///     使用参数数组提供参数
        /// </summary>
        /// <param name="connecttionString">一个现有的数据库连接</param>
        /// <param name="cmdTye">OleDbCommand命令类型</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText,
            OleDbParameter[] commandParameters)
        {
            var cmd = new OleDbCommand();
            var ds = new DataSet();
            using (var conn = new OleDbConnection(connecttionString))
            {
                PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters);
                var adapter = new OleDbDataAdapter();
                adapter.SelectCommand = cmd;
                adapter.Fill(ds);
            }
            var table = ds.Tables;
            return table;
        }

        /// <summary>
        ///     执行一条返回结果集的OleDbCommand，通过一个已经存在的数据库连接
        ///     使用参数数组提供参数
        /// </summary>
        /// <param name="cmdTye">OleDbCommand命令类型</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTable(CommandType cmdTye, string cmdText,
            OleDbParameter[] commandParameters)
        {
            return GetTable(cmdTye, cmdText, commandParameters);
        }


        /// <summary>
        ///     存储过程专用
        /// </summary>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTableProducts(string cmdText, OleDbParameter[] commandParameters)
        {
            return GetTable(CommandType.StoredProcedure, cmdText, commandParameters);
        }

        /// <summary>
        ///     Sql语句专用
        /// </summary>
        /// <param name="cmdText"> T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
        public static DataTableCollection GetTableText(string cmdText, OleDbParameter[] commandParameters)
        {
            return GetTable(CommandType.Text, cmdText, commandParameters);
        }

        #endregion

        #region//ExecuteDataSet方法

        /// <summary>
        ///     return a dataset
        /// </summary>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            var conn = new OleDbConnection(connectionString);
            var cmd = new OleDbCommand();
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                var da = new OleDbDataAdapter();
                var ds = new DataSet();
                da.SelectCommand = cmd;
                da.Fill(ds);
                return ds;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }


        /// <summary>
        ///     返回一个DataSet
        /// </summary>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);
        }

        /// <summary>
        ///     返回一个DataSet
        /// </summary>
        /// <param name="cmdText">存储过程的名字</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSetProducts(string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
        }

        /// <summary>
        ///     返回一个DataSet
        /// </summary>
        /// <param name="cmdText">T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>return a dataset</returns>
        public static DataSet ExecuteDataSetText(string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters);
        }


        public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction,
            CommandType cmdType, string cmdText, params OleDbParameter[] commandParameters)
        {
            var conn = new OleDbConnection(connectionString);
            var cmd = new OleDbCommand();
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                var da = new OleDbDataAdapter();
                var ds = new DataSet();
                da.SelectCommand = cmd;
                da.Fill(ds);
                var dv = ds.Tables[0].DefaultView;
                dv.Sort = sortExpression + " " + direction;
                return dv;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }

        #endregion

        #region // ExecuteScalar方法

        /// <summary>
        ///     返回第一行的第一列
        /// </summary>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个对象</returns>
        public static object ExecuteScalar(CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            return ExecuteScalar(connectionString, cmdType, cmdText, commandParameters);
        }

        /// <summary>
        ///     返回第一行的第一列存储过程专用
        /// </summary>
        /// <param name="cmdText">存储过程的名字</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个对象</returns>
        public static object ExecuteScalarProducts(string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecuteScalar(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
        }

        /// <summary>
        ///     返回第一行的第一列Sql语句专用
        /// </summary>
        /// <param name="cmdText">者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>返回一个对象</returns>
        public static object ExecuteScalarText(string cmdText, params OleDbParameter[] commandParameters)
        {
            return ExecuteScalar(connectionString, CommandType.Text, cmdText, commandParameters);
        }

        /// <summary>
        ///     Execute a OleDbCommand that returns the first column of the first record against the database specified in the
        ///     connection string
        ///     using the provided parameters.
        /// </summary>
        /// <remarks>
        ///     e.g.:
        ///     Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OleDbParameter("@prodid",
        ///     24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            var cmd = new OleDbCommand();

            using (var connection = new OleDbConnection(connectionString))
            {
                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
                var val = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>
        ///     Execute a OleDbCommand that returns the first column of the first record against an existing database connection
        ///     using the provided parameters.
        /// </summary>
        /// <remarks>
        ///     e.g.:
        ///     Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new OleDbParameter("@prodid",
        ///     24));
        /// </remarks>
        /// <param name="connectionString">一个有效的数据库连接字符串</param>
        /// <param name="cmdType">OleDbCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
        /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
        /// <param name="commandParameters">以数组形式提供OleDbCommand命令中用到的参数列表</param>
        /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
        public static object ExecuteScalar(OleDbConnection connection, CommandType cmdType, string cmdText,
            params OleDbParameter[] commandParameters)
        {
            var cmd = new OleDbCommand();
            PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
            var val = cmd.ExecuteScalar();
            cmd.Parameters.Clear();
            return val;
        }

        #endregion
    }
}